Quote:
Originally Posted by oab_au
A change of octane doesn't increase "combustion chamber pressure or temps."
They did not need harden valve seats, they used Tetra ethel lead to lube them and raise the octane.
Back then the octane was about 85, 200,,,,,,,,,  still havent got there yet..
The chemistry remains the same, we just have two system to rate it Mon and Ron.
Harvey. |
Hmmm I'd have thought for sure, that the slower burning characteristics would have raised temps & pressures.
I misspoke about chemistry. I meant that the older fuels were rated the same way (RON) whilst current AvGas is rated with MON, on a rich, or lean scale. These scales are based on boosted, or non boosted applications. The higher ratings are for richer, boosted applications.
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